@Conman - It'd be really nice if half of his upper body wasn't MIA. o_o For text, I recommend using either all caps or all lower case. Rarely does capital letters only look good, and this is not the case. Get rid of that line under Feraligatr, too. It's out of place and it's disrupting the flow.
@Akari - Green is a hard color to pull off in tags, so I'd stay away from it. Plus, there's way too much of it. Add some magenta to even out the green, and then use some colors that aren't so bright.
@Poke'd - It's really plain, and I'm not a fan of the swirls overlapping the stock. Also irked by the fact that the beam thing wasn't cleanly cut. Have the tag flow <--- since that's how your stock flows, so arrange the swirls accordingly. It needs a ton of depth, too, since there currently is zero. Scrap the text, too.
@Akari x2 - It looks just like the stock slapped on a black background with a little drop shadow/bevel added to it and a few scanlines here and there. I understand that your tag wants a night feel, but you can achieve that without using infinitely dark colors. Since you already have text and tiny text, I'd scrap the text with your name.
@Evilcheese - Hmm... it's an interesting concept, although I think it'd be a heck of a lot better with a smaller canvas. It's extremely plain, and it'd be better if you made the lineart curvy.
@Kai - Way too green, and the bluriness of that arrow bothers me. The text sticks out too much and blurred vectors look strange.
@Viper - The glow around Gengar needs to go, and you have two lightsources. One the lens flare, and the other in the bottom left. Also, add more of a foreground since it's all background right now. And add some depth, too.
Phew. <: D